Radiation of extant cetaceans driven by restructuring of the oceans.
The remarkable fossil record of whales and dolphins (Cetacea) has made them an exemplar of macroevolution. Although their overall adaptive transition from terrestrial to fully aquatic organisms is well known, this is not true for the radiation of modern whales. Here, we explore the diversification o...
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ftcdlib:oai:escholarship.org:ark:/13030/qt86c326j0 2023-05-15T18:33:32+02:00 Radiation of extant cetaceans driven by restructuring of the oceans. Steeman, Mette E Hebsgaard, Martin B Fordyce, R Ewan Ho, Simon YW Rabosky, Daniel L Nielsen, Rasmus Rahbek, Carsten Glenner, Henrik Sørensen, Martin V Willerslev, Eske 573 - 585 2009-12-01 application/pdf https://escholarship.org/uc/item/86c326j0 unknown eScholarship, University of California qt86c326j0 https://escholarship.org/uc/item/86c326j0 public Systematic biology, vol 58, iss 6 Animals Cetacea Likelihood Functions Bayes Theorem Sequence Alignment Echolocation Feeding Behavior Computational Biology Environment Evolution Molecular Phylogeny Base Sequence Fossils Oceans and Seas Genetic Speciation molecular phylogeny palaeo-ocean restructuring speciation Life Below Water Evolutionary Biology Genetics article 2009 ftcdlib 2022-12-19T18:37:20Z The remarkable fossil record of whales and dolphins (Cetacea) has made them an exemplar of macroevolution. Although their overall adaptive transition from terrestrial to fully aquatic organisms is well known, this is not true for the radiation of modern whales. Here, we explore the diversification of extant cetaceans by constructing a robust molecular phylogeny that includes 87 of 89 extant species. The phylogeny and divergence times are derived from nuclear and mitochondrial markers, calibrated with fossils. We find that the toothed whales are monophyletic, suggesting that echolocation evolved only once early in that lineage some 36-34 Ma. The rorqual family (Balaenopteridae) is restored with the exclusion of the gray whale, suggesting that gulp feeding evolved 18-16 Ma. Delphinida, comprising all living dolphins and porpoises other than the Ganges/Indus dolphins, originated about 26 Ma; it contains the taxonomically rich delphinids, which began diversifying less than 11 Ma. We tested 2 hypothesized drivers of the extant cetacean radiation by assessing the tempo of lineage accumulation through time. We find no support for a rapid burst of speciation early in the history of extant whales, contrasting with expectations of an adaptive radiation model. However, we do find support for increased diversification rates during periods of pronounced physical restructuring of the oceans. The results imply that paleogeographic and paleoceanographic changes, such as closure of major seaways, have influenced the dynamics of radiation in extant cetaceans. Article in Journal/Newspaper toothed whales University of California: eScholarship Rorqual ENVELOPE(-62.311,-62.311,-65.648,-65.648) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Animals Cetacea Likelihood Functions Bayes Theorem Sequence Alignment Echolocation Feeding Behavior Computational Biology Environment Evolution Molecular Phylogeny Base Sequence Fossils Oceans and Seas Genetic Speciation molecular phylogeny palaeo-ocean restructuring speciation Life Below Water Evolutionary Biology Genetics |
spellingShingle |
Animals Cetacea Likelihood Functions Bayes Theorem Sequence Alignment Echolocation Feeding Behavior Computational Biology Environment Evolution Molecular Phylogeny Base Sequence Fossils Oceans and Seas Genetic Speciation molecular phylogeny palaeo-ocean restructuring speciation Life Below Water Evolutionary Biology Genetics Steeman, Mette E Hebsgaard, Martin B Fordyce, R Ewan Ho, Simon YW Rabosky, Daniel L Nielsen, Rasmus Rahbek, Carsten Glenner, Henrik Sørensen, Martin V Willerslev, Eske Radiation of extant cetaceans driven by restructuring of the oceans. |
topic_facet |
Animals Cetacea Likelihood Functions Bayes Theorem Sequence Alignment Echolocation Feeding Behavior Computational Biology Environment Evolution Molecular Phylogeny Base Sequence Fossils Oceans and Seas Genetic Speciation molecular phylogeny palaeo-ocean restructuring speciation Life Below Water Evolutionary Biology Genetics |
description |
The remarkable fossil record of whales and dolphins (Cetacea) has made them an exemplar of macroevolution. Although their overall adaptive transition from terrestrial to fully aquatic organisms is well known, this is not true for the radiation of modern whales. Here, we explore the diversification of extant cetaceans by constructing a robust molecular phylogeny that includes 87 of 89 extant species. The phylogeny and divergence times are derived from nuclear and mitochondrial markers, calibrated with fossils. We find that the toothed whales are monophyletic, suggesting that echolocation evolved only once early in that lineage some 36-34 Ma. The rorqual family (Balaenopteridae) is restored with the exclusion of the gray whale, suggesting that gulp feeding evolved 18-16 Ma. Delphinida, comprising all living dolphins and porpoises other than the Ganges/Indus dolphins, originated about 26 Ma; it contains the taxonomically rich delphinids, which began diversifying less than 11 Ma. We tested 2 hypothesized drivers of the extant cetacean radiation by assessing the tempo of lineage accumulation through time. We find no support for a rapid burst of speciation early in the history of extant whales, contrasting with expectations of an adaptive radiation model. However, we do find support for increased diversification rates during periods of pronounced physical restructuring of the oceans. The results imply that paleogeographic and paleoceanographic changes, such as closure of major seaways, have influenced the dynamics of radiation in extant cetaceans. |
format |
Article in Journal/Newspaper |
author |
Steeman, Mette E Hebsgaard, Martin B Fordyce, R Ewan Ho, Simon YW Rabosky, Daniel L Nielsen, Rasmus Rahbek, Carsten Glenner, Henrik Sørensen, Martin V Willerslev, Eske |
author_facet |
Steeman, Mette E Hebsgaard, Martin B Fordyce, R Ewan Ho, Simon YW Rabosky, Daniel L Nielsen, Rasmus Rahbek, Carsten Glenner, Henrik Sørensen, Martin V Willerslev, Eske |
author_sort |
Steeman, Mette E |
title |
Radiation of extant cetaceans driven by restructuring of the oceans. |
title_short |
Radiation of extant cetaceans driven by restructuring of the oceans. |
title_full |
Radiation of extant cetaceans driven by restructuring of the oceans. |
title_fullStr |
Radiation of extant cetaceans driven by restructuring of the oceans. |
title_full_unstemmed |
Radiation of extant cetaceans driven by restructuring of the oceans. |
title_sort |
radiation of extant cetaceans driven by restructuring of the oceans. |
publisher |
eScholarship, University of California |
publishDate |
2009 |
url |
https://escholarship.org/uc/item/86c326j0 |
op_coverage |
573 - 585 |
long_lat |
ENVELOPE(-62.311,-62.311,-65.648,-65.648) |
geographic |
Rorqual |
geographic_facet |
Rorqual |
genre |
toothed whales |
genre_facet |
toothed whales |
op_source |
Systematic biology, vol 58, iss 6 |
op_relation |
qt86c326j0 https://escholarship.org/uc/item/86c326j0 |
op_rights |
public |
_version_ |
1766218166638215168 |